You are designing a public health intervention in a low-income region with high rates of childhood night blindness. Which combined strategy targets both prevention and immediate treatment most effectively?

Provide periodic high-dose vitamin A supplementation for children, promote dietary diversification including animal-source foods and provitamin A vegetables, and implement monitoring for vision outcomes—this addresses acute deficiency and longer-term intake.

Recommend universal sunscreen application to children to prevent vitamin A photodegradation, since sunlight exposure destroys preformed vitamin A in the skin and worsens deficiency.

Advise exclusive breastfeeding cessation at 3 months and immediate weaning to avoid maternal transfer of excess provitamin A causing conjunctival irritation in infants.

Focus only on distributing fortified iodized salt because iodine deficiency is the primary cause of night blindness in children and will correct vitamin A levels indirectly.